2 in 1 Mono and Dual Stereo design, lightweight and has outstanding stereo voice. Ultra-clear sound speaker & utmost sensitive microphone. Both headset & hands-free profile integrated. User-friendly adjustability & comfortable wearing on both right and left ear. Support Bluetooth V2.0 and compatible with any Bluetooth enabled mobile phones. Convertible A2DP headset. Very convenient for you to enjoy the music and answer calls. Support EDR (enhanced data rate). About 100 hours long standby time. Adjustable volume control. Transmission distance: 10M. A must-have fashionable product.